Add file with implicit call to blocking method (#1941)

Reproducer for this fix: quarkusio/quarkus#40721

(cherry picked from commit a2f4bc1)

http/rest-client-reactive/src/main/java/com/redhat/BrokenBlockingApi.java

@@ -0,0 +1,30 @@
+package com.redhat; // this bug can not be reproduced for classes in io.quarkus package
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.core.Response;
+
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+
+import io.quarkus.rest.client.reactive.ClientExceptionMapper;
+import io.smallrye.common.annotation.Blocking;
+
+/**
+ * Reproducer for compilation failure
+ * See https://github.com/quarkusio/quarkus/issues/38275#issuecomment-2115117993
+ */
+@RegisterRestClient
+public interface BrokenBlockingApi {
+    @GET
+    @Path("/")
+    String request();
+
+    @Blocking
+    @ClientExceptionMapper
+    static RuntimeException toException(Response response) {
+        String entity = response.readEntity(String.class).isEmpty()
+                ? response.getStatusInfo().getReasonPhrase()
+                : response.readEntity(String.class);
+        return new RuntimeException(entity);
+    }
+}